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structboost_1_1hana_1_1tuple.html

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  131. <a href="#related">Synopsis of associated functions</a> &#124;
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  136. <div class="title">boost::hana::tuple&lt; Xn &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group__group-datatypes.html">Data types</a></div></div>  </div>
    137. 

  137. </div><!--header-->
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  138. <div class="contents">
    139. 

  139. <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
    140. 

  140. <div class="textblock"><h3>template&lt;typename ... Xn&gt;<br />
    141. 

  141. struct boost::hana::tuple&lt; Xn &gt;</h3>
    142. 

  142. 

  143. <p>General purpose index-based heterogeneous sequence with a fixed length. </p>
    144. 

  144. <p>The tuple is the bread and butter for static metaprogramming. Conceptually, it is like a <code><a class="el" href="structstd_1_1tuple.html" title="Adapter for std::tuples.">std::tuple</a></code>; it is a container able of holding objects of different types and whose size is fixed at compile-time. However, Hana's tuple provides much more functionality than its <code>std</code> counterpart, and it is also much more efficient than all standard library implementations tested so far.</p>
    145. 

  145. <p>Tuples are index-based sequences. If you need an associative sequence with a key-based access, then you should consider <code><a class="el" href="structboost_1_1hana_1_1map.html" title="Basic associative container requiring unique, Comparable and Hashable keys.">hana::map</a></code> or <code><a class="el" href="structboost_1_1hana_1_1set.html" title="Basic unordered container requiring unique, Comparable and Hashable keys.">hana::set</a></code> instead.</p>
    146. 

  146. <dl class="section note"><dt>Note</dt><dd>When you use a container, remember not to make assumptions about its representation, unless the documentation gives you those guarantees. More details <a class="el" href="index.html#tutorial-containers-types">in the tutorial</a>.</dd></dl>
    147. 

  147. <h2>Modeled concepts </h2>
    148. 

  148. <p><code>Sequence</code>, and all the concepts it refines</p>
    149. 

  149. <h2>Provided operators </h2>
    150. 

  150. <p>For convenience, the following operators are provided: </p><div class="fragment"><div class="line">xs == ys        -&gt;          <a class="code" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547">equal</a>(xs, ys)</div><div class="line">xs != ys        -&gt;          <a class="code" href="group__group-Comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd">not_equal</a>(xs, ys)</div><div class="line"></div><div class="line">xs &lt; ys         -&gt;          <a class="code" href="group__group-Orderable.html#gad510011602bdb14686f1c4ec145301c9">less</a>(xs, ys)</div><div class="line">xs &lt;= ys        -&gt;          <a class="code" href="group__group-Orderable.html#ga9917dd82beb67151bf5657245d37b851">less_equal</a>(xs, ys)</div><div class="line">xs &gt; ys         -&gt;          <a class="code" href="group__group-Orderable.html#gaf9a073eafebbe514fb19dff82318f198">greater</a>(xs, ys)</div><div class="line">xs &gt;= ys        -&gt;          <a class="code" href="group__group-Orderable.html#ga6023631e7d0a01e16dc3fa4221fbd703">greater_equal</a>(xs, ys)</div><div class="line"></div><div class="line">xs | f          -&gt;          <a class="code" href="group__group-Monad.html#ga05fdc2f887cb9967357487a432ace98b">chain</a>(xs, f)</div><div class="line"></div><div class="line">xs[n]           -&gt;          <a class="code" href="group__group-Iterable.html#ga8a484304380eae38f3d9663d98860129">at</a>(xs, n)</div></div><!-- fragment --><h2>Example </h2>
    151. 

  151. <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="integral__constant_8hpp.html">boost/hana/integral_constant.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="transform_8hpp.html">boost/hana/transform.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;string&gt;</span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"><span class="keyword">using namespace </span>hana::literals;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keyword">struct </span>Fish { std::string name; };</div><div class="line"><span class="keyword">struct </span>Cat  { std::string name; };</div><div class="line"><span class="keyword">struct </span>Dog  { std::string name; };</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line">    hana::tuple&lt;Fish, Cat, Dog&gt; animals{{<span class="stringliteral">&quot;Nemo&quot;</span>}, {<span class="stringliteral">&quot;Garfield&quot;</span>}, {<span class="stringliteral">&quot;Snoopy&quot;</span>}};</div><div class="line">    animals[0_c].name = <span class="stringliteral">&quot;Moby Dick&quot;</span>; <span class="comment">// can modify elements in place, like std::tuple</span></div><div class="line"></div><div class="line">    <span class="keyword">auto</span> names = <a class="code" href="group__group-Functor.html#ga5a8975f6e55375d5b6038a9c36ee63e7">hana::transform</a>(animals, [](<span class="keyword">auto</span> a) {</div><div class="line">      <span class="keywordflow">return</span> a.name;</div><div class="line">    });</div><div class="line"></div><div class="line">    <a class="code" href="group__group-assertions.html#ga4796ae107d58b67e0bbccd5ae6f70101">BOOST_HANA_RUNTIME_CHECK</a>(names == hana::make_tuple(<span class="stringliteral">&quot;Moby Dick&quot;</span>, <span class="stringliteral">&quot;Garfield&quot;</span>, <span class="stringliteral">&quot;Snoopy&quot;</span>));</div><div class="line">}</div></div><!-- fragment --> </div><div id="dynsection-0" onclick="return toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;">
    152. 

  152.   <img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for boost::hana::tuple&lt; Xn &gt;:</div>
    153. 

  153. <div id="dynsection-0-summary" class="dynsummary" style="display:block;">
    154. 

  154. </div>
    155. 

  155. <div id="dynsection-0-content" class="dyncontent" style="display:none;">
    156. 

  156.  <div class="center">
    157. 

  157.   <img src="structboost_1_1hana_1_1tuple.png" usemap="#boost::hana::tuple_3C_20Xn_20_3E_map" alt=""/>
    158. 

  158.   <map id="boost::hana::tuple_3C_20Xn_20_3E_map" name="boost::hana::tuple_3C_20Xn_20_3E_map">
    159. 

  159. <area href="structboost_1_1hana_1_1detail_1_1operators_1_1adl.html" alt="boost::hana::detail::operators::adl&lt; tuple&lt; Xn... &gt; &gt;" shape="rect" coords="0,0,298,24"/>
    160. 

  160.   </map>
    161. 

  161. </div></div>
    162. 

  162. <table class="memberdecls">
    163. 

  163. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="related"></a>
    164. 

  164. Synopsis of associated functions</h2></td></tr>
    165. 

  165. <tr class="memitem:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="memTemplParams" colspan="2">template&lt;&gt; </td></tr>
    166. 

  166. <tr class="memitem:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ad9d8c7efa77e573eba2dfc48b3343e66">make&lt; tuple_tag &gt;</a></td></tr>
    167. 

  167. <tr class="memdesc:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function object for creating a <code>tuple</code>.  <a href="#ad9d8c7efa77e573eba2dfc48b3343e66">More...</a><br /></td></tr>
    168. 

  168. <tr class="separator:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="memSeparator" colspan="2">&#160;</td></tr>
    169. 

  169. <tr class="memitem:af3c175cfb83276339f91e867d738a2e6"><td class="memItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#af3c175cfb83276339f91e867d738a2e6">make_tuple</a> = <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a>&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>&gt;</td></tr>
    170. 

  170. <tr class="memdesc:af3c175cfb83276339f91e867d738a2e6"><td class="mdescLeft">&#160;</td><td class="mdescRight">Alias to <code>make&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;</code>; provided for convenience.  <a href="#af3c175cfb83276339f91e867d738a2e6">More...</a><br /></td></tr>
    171. 

  171. <tr class="separator:af3c175cfb83276339f91e867d738a2e6"><td class="memSeparator" colspan="2">&#160;</td></tr>
    172. 

  172. <tr class="memitem:a749b564c8f115957837761d75191beac"><td class="memItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a749b564c8f115957837761d75191beac">to_tuple</a> = <a class="el" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">to</a>&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>&gt;</td></tr>
    173. 

  173. <tr class="memdesc:a749b564c8f115957837761d75191beac"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code>to&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;</code>; provided for convenience.  <a href="#a749b564c8f115957837761d75191beac">More...</a><br /></td></tr>
    174. 

  174. <tr class="separator:a749b564c8f115957837761d75191beac"><td class="memSeparator" colspan="2">&#160;</td></tr>
    175. 

  175. <tr class="memitem:a1997546daf58a48cc15498d338a03da3"><td class="memTemplParams" colspan="2">template&lt;typename ... T&gt; </td></tr>
    176. 

  176. <tr class="memitem:a1997546daf58a48cc15498d338a03da3"><td class="memTemplItemLeft" align="right" valign="top">constexpr implementation_defined&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a1997546daf58a48cc15498d338a03da3">tuple_t</a> {}</td></tr>
    177. 

  177. <tr class="memdesc:a1997546daf58a48cc15498d338a03da3"><td class="mdescLeft">&#160;</td><td class="mdescRight">Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1type.html" title="C++ type in value-level representation.">hana::type</a></code>s.  <a href="#a1997546daf58a48cc15498d338a03da3">More...</a><br /></td></tr>
    178. 

  178. <tr class="separator:a1997546daf58a48cc15498d338a03da3"><td class="memSeparator" colspan="2">&#160;</td></tr>
    179. 

  179. <tr class="memitem:a85c2f16caa2a1e12eefd1b3f69fa658e"><td class="memTemplParams" colspan="2">template&lt;typename T , T ... v&gt; </td></tr>
    180. 

  180. <tr class="memitem:a85c2f16caa2a1e12eefd1b3f69fa658e"><td class="memTemplItemLeft" align="right" valign="top">constexpr implementation_defined&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a85c2f16caa2a1e12eefd1b3f69fa658e">tuple_c</a> {}</td></tr>
    181. 

  181. <tr class="memdesc:a85c2f16caa2a1e12eefd1b3f69fa658e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">hana::integral_constant</a></code>s.  <a href="#a85c2f16caa2a1e12eefd1b3f69fa658e">More...</a><br /></td></tr>
    182. 

  182. <tr class="separator:a85c2f16caa2a1e12eefd1b3f69fa658e"><td class="memSeparator" colspan="2">&#160;</td></tr>
    183. 

  183. </table><table class="memberdecls">
    184. 

  184. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="friends"></a>
    185. 

  185. Friends</h2></td></tr>
    186. 

  186. <tr class="memitem:a59b4d21f17e2caed8c31d8389d0f0878"><td class="memTemplParams" colspan="2"><a id="a59b4d21f17e2caed8c31d8389d0f0878"></a>
    187. 

  187. template&lt;typename ... T, typename F &gt; </td></tr>
    188. 

  188. <tr class="memitem:a59b4d21f17e2caed8c31d8389d0f0878"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a59b4d21f17e2caed8c31d8389d0f0878">operator|</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>&lt; T... &gt;, F)</td></tr>
    189. 

  189. <tr class="memdesc:a59b4d21f17e2caed8c31d8389d0f0878"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Monad.html#ga05fdc2f887cb9967357487a432ace98b" title="Feed a monadic value into a monadic computation.Given a monadic value and a monadic function,...">hana::chain</a></code>. <br /></td></tr>
    190. 

  190. <tr class="separator:a59b4d21f17e2caed8c31d8389d0f0878"><td class="memSeparator" colspan="2">&#160;</td></tr>
    191. 

  191. <tr class="memitem:a27607958295e6da8a0ba602a2db468f1"><td class="memTemplParams" colspan="2"><a id="a27607958295e6da8a0ba602a2db468f1"></a>
    192. 

  192. template&lt;typename X , typename Y &gt; </td></tr>
    193. 

  193. <tr class="memitem:a27607958295e6da8a0ba602a2db468f1"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a27607958295e6da8a0ba602a2db468f1">operator==</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
    194. 

  194. <tr class="memdesc:a27607958295e6da8a0ba602a2db468f1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547" title="Returns a Logical representing whether x is equal to y.The equal function can be called in two differ...">hana::equal</a></code> <br /></td></tr>
    195. 

  195. <tr class="separator:a27607958295e6da8a0ba602a2db468f1"><td class="memSeparator" colspan="2">&#160;</td></tr>
    196. 

  196. <tr class="memitem:a0cae3af55edb3eb05bfa184bda633f7d"><td class="memTemplParams" colspan="2"><a id="a0cae3af55edb3eb05bfa184bda633f7d"></a>
    197. 

  197. template&lt;typename X , typename Y &gt; </td></tr>
    198. 

  198. <tr class="memitem:a0cae3af55edb3eb05bfa184bda633f7d"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a0cae3af55edb3eb05bfa184bda633f7d">operator!=</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
    199. 

  199. <tr class="memdesc:a0cae3af55edb3eb05bfa184bda633f7d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd" title="Returns a Logical representing whether x is not equal to y.The not_equal function can be called in tw...">hana::not_equal</a></code> <br /></td></tr>
    200. 

  200. <tr class="separator:a0cae3af55edb3eb05bfa184bda633f7d"><td class="memSeparator" colspan="2">&#160;</td></tr>
    201. 

  201. <tr class="memitem:ada078dcf9e68b8e9a82b33c75dde8457"><td class="memTemplParams" colspan="2"><a id="ada078dcf9e68b8e9a82b33c75dde8457"></a>
    202. 

  202. template&lt;typename X , typename Y &gt; </td></tr>
    203. 

  203. <tr class="memitem:ada078dcf9e68b8e9a82b33c75dde8457"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ada078dcf9e68b8e9a82b33c75dde8457">operator&lt;</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
    204. 

  204. <tr class="memdesc:ada078dcf9e68b8e9a82b33c75dde8457"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#gad510011602bdb14686f1c4ec145301c9" title="Returns a Logical representing whether x is less than y.">hana::less</a></code> <br /></td></tr>
    205. 

  205. <tr class="separator:ada078dcf9e68b8e9a82b33c75dde8457"><td class="memSeparator" colspan="2">&#160;</td></tr>
    206. 

  206. <tr class="memitem:aedd11fddefddbbbb87d3b24c7117528f"><td class="memTemplParams" colspan="2"><a id="aedd11fddefddbbbb87d3b24c7117528f"></a>
    207. 

  207. template&lt;typename X , typename Y &gt; </td></tr>
    208. 

  208. <tr class="memitem:aedd11fddefddbbbb87d3b24c7117528f"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#aedd11fddefddbbbb87d3b24c7117528f">operator&gt;</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
    209. 

  209. <tr class="memdesc:aedd11fddefddbbbb87d3b24c7117528f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#gaf9a073eafebbe514fb19dff82318f198" title="Returns a Logical representing whether x is greater than y.">hana::greater</a></code> <br /></td></tr>
    210. 

  210. <tr class="separator:aedd11fddefddbbbb87d3b24c7117528f"><td class="memSeparator" colspan="2">&#160;</td></tr>
    211. 

  211. <tr class="memitem:a53817979990da799e659b2576799a79a"><td class="memTemplParams" colspan="2"><a id="a53817979990da799e659b2576799a79a"></a>
    212. 

  212. template&lt;typename X , typename Y &gt; </td></tr>
    213. 

  213. <tr class="memitem:a53817979990da799e659b2576799a79a"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a53817979990da799e659b2576799a79a">operator&lt;=</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
    214. 

  214. <tr class="memdesc:a53817979990da799e659b2576799a79a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#ga9917dd82beb67151bf5657245d37b851" title="Returns a Logical representing whether x is less than or equal to y.">hana::less_equal</a></code> <br /></td></tr>
    215. 

  215. <tr class="separator:a53817979990da799e659b2576799a79a"><td class="memSeparator" colspan="2">&#160;</td></tr>
    216. 

  216. <tr class="memitem:aa3f0436b623de5208767751e1e9f7e59"><td class="memTemplParams" colspan="2"><a id="aa3f0436b623de5208767751e1e9f7e59"></a>
    217. 

  217. template&lt;typename X , typename Y &gt; </td></tr>
    218. 

  218. <tr class="memitem:aa3f0436b623de5208767751e1e9f7e59"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#aa3f0436b623de5208767751e1e9f7e59">operator&gt;=</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
    219. 

  219. <tr class="memdesc:aa3f0436b623de5208767751e1e9f7e59"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#ga6023631e7d0a01e16dc3fa4221fbd703" title="Returns a Logical representing whether x is greater than or equal to y.">hana::greater_equal</a></code> <br /></td></tr>
    220. 

  220. <tr class="separator:aa3f0436b623de5208767751e1e9f7e59"><td class="memSeparator" colspan="2">&#160;</td></tr>
    221. 

  221. </table><table class="memberdecls">
    222. 

  222. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
    223. 

  223. Public Member Functions</h2></td></tr>
    224. 

  224. <tr class="memitem:a8e10223983bfb3873c285be85f7ab273"><td class="memItemLeft" align="right" valign="top"><a id="a8e10223983bfb3873c285be85f7ab273"></a>
    225. 

  225. constexpr&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a8e10223983bfb3873c285be85f7ab273">tuple</a> ()</td></tr>
    226. 

  226. <tr class="memdesc:a8e10223983bfb3873c285be85f7ab273"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default constructs the <code>tuple</code>. Only exists when all the elements of the tuple are default constructible. <br /></td></tr>
    227. 

  227. <tr class="separator:a8e10223983bfb3873c285be85f7ab273"><td class="memSeparator" colspan="2">&#160;</td></tr>
    228. 

  228. <tr class="memitem:a4e4e6193df38146b1eab93bcf963fc81"><td class="memItemLeft" align="right" valign="top">constexpr&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a4e4e6193df38146b1eab93bcf963fc81">tuple</a> (Xn const &amp;...xn)</td></tr>
    229. 

  229. <tr class="memdesc:a4e4e6193df38146b1eab93bcf963fc81"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialize each element of the tuple with the corresponding element from <code>xn...</code>. Only exists when all the elements of the tuple are copy-constructible.  <a href="#a4e4e6193df38146b1eab93bcf963fc81">More...</a><br /></td></tr>
    230. 

  230. <tr class="separator:a4e4e6193df38146b1eab93bcf963fc81"><td class="memSeparator" colspan="2">&#160;</td></tr>
    231. 

  231. <tr class="memitem:a9a5dd3930d94a900190de98247e0c415"><td class="memTemplParams" colspan="2">template&lt;typename ... Yn&gt; </td></tr>
    232. 

  232. <tr class="memitem:a9a5dd3930d94a900190de98247e0c415"><td class="memTemplItemLeft" align="right" valign="top">constexpr&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a9a5dd3930d94a900190de98247e0c415">tuple</a> (Yn &amp;&amp;...yn)</td></tr>
    233. 

  233. <tr class="memdesc:a9a5dd3930d94a900190de98247e0c415"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialize each element of the tuple by perfect-forwarding the corresponding element in <code>yn...</code>. Only exists when all the elements of the created tuple are constructible from the corresponding perfect-forwarded value.  <a href="#a9a5dd3930d94a900190de98247e0c415">More...</a><br /></td></tr>
    234. 

  234. <tr class="separator:a9a5dd3930d94a900190de98247e0c415"><td class="memSeparator" colspan="2">&#160;</td></tr>
    235. 

  235. <tr class="memitem:a6cf99e86ab1506594eca03881748fe91"><td class="memTemplParams" colspan="2"><a id="a6cf99e86ab1506594eca03881748fe91"></a>
    236. 

  236. template&lt;typename ... Yn&gt; </td></tr>
    237. 

  237. <tr class="memitem:a6cf99e86ab1506594eca03881748fe91"><td class="memTemplItemLeft" align="right" valign="top">constexpr&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a6cf99e86ab1506594eca03881748fe91">tuple</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>&lt; Yn... &gt; const &amp;other)</td></tr>
    238. 

  238. <tr class="memdesc:a6cf99e86ab1506594eca03881748fe91"><td class="mdescLeft">&#160;</td><td class="mdescRight">Copy-initialize a tuple from another tuple. Only exists when all the elements of the constructed tuple are copy-constructible from the corresponding element in the source tuple. <br /></td></tr>
    239. 

  239. <tr class="separator:a6cf99e86ab1506594eca03881748fe91"><td class="memSeparator" colspan="2">&#160;</td></tr>
    240. 

  240. <tr class="memitem:ac504757198d85ab9de1258de634e3b71"><td class="memTemplParams" colspan="2"><a id="ac504757198d85ab9de1258de634e3b71"></a>
    241. 

  241. template&lt;typename ... Yn&gt; </td></tr>
    242. 

  242. <tr class="memitem:ac504757198d85ab9de1258de634e3b71"><td class="memTemplItemLeft" align="right" valign="top">constexpr&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ac504757198d85ab9de1258de634e3b71">tuple</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>&lt; Yn... &gt; &amp;&amp;other)</td></tr>
    243. 

  243. <tr class="memdesc:ac504757198d85ab9de1258de634e3b71"><td class="mdescLeft">&#160;</td><td class="mdescRight">Move-initialize a tuple from another tuple. Only exists when all the elements of the constructed tuple are move-constructible from the corresponding element in the source tuple. <br /></td></tr>
    244. 

  244. <tr class="separator:ac504757198d85ab9de1258de634e3b71"><td class="memSeparator" colspan="2">&#160;</td></tr>
    245. 

  245. <tr class="memitem:acddfa6d631c249ae667d52dd63c0aeaf"><td class="memTemplParams" colspan="2"><a id="acddfa6d631c249ae667d52dd63c0aeaf"></a>
    246. 

  246. template&lt;typename ... Yn&gt; </td></tr>
    247. 

  247. <tr class="memitem:acddfa6d631c249ae667d52dd63c0aeaf"><td class="memTemplItemLeft" align="right" valign="top">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> &amp;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#acddfa6d631c249ae667d52dd63c0aeaf">operator=</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>&lt; Yn... &gt; const &amp;other)</td></tr>
    248. 

  248. <tr class="memdesc:acddfa6d631c249ae667d52dd63c0aeaf"><td class="mdescLeft">&#160;</td><td class="mdescRight">Assign a tuple to another tuple. Only exists when all the elements of the destination tuple are assignable from the corresponding element in the source tuple. <br /></td></tr>
    249. 

  249. <tr class="separator:acddfa6d631c249ae667d52dd63c0aeaf"><td class="memSeparator" colspan="2">&#160;</td></tr>
    250. 

  250. <tr class="memitem:ad3f0fe520974a22cc12a978f4b061caa"><td class="memTemplParams" colspan="2"><a id="ad3f0fe520974a22cc12a978f4b061caa"></a>
    251. 

  251. template&lt;typename ... Yn&gt; </td></tr>
    252. 

  252. <tr class="memitem:ad3f0fe520974a22cc12a978f4b061caa"><td class="memTemplItemLeft" align="right" valign="top">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> &amp;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ad3f0fe520974a22cc12a978f4b061caa">operator=</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>&lt; Yn... &gt; &amp;&amp;other)</td></tr>
    253. 

  253. <tr class="memdesc:ad3f0fe520974a22cc12a978f4b061caa"><td class="mdescLeft">&#160;</td><td class="mdescRight">Move-assign a tuple to another tuple. Only exists when all the elements of the destination tuple are move-assignable from the corresponding element in the source tuple. <br /></td></tr>
    254. 

  254. <tr class="separator:ad3f0fe520974a22cc12a978f4b061caa"><td class="memSeparator" colspan="2">&#160;</td></tr>
    255. 

  255. <tr class="memitem:acef38216a6c6da0296a5f7b5241e951b"><td class="memTemplParams" colspan="2"><a id="acef38216a6c6da0296a5f7b5241e951b"></a>
    256. 

  256. template&lt;typename N &gt; </td></tr>
    257. 

  257. <tr class="memitem:acef38216a6c6da0296a5f7b5241e951b"><td class="memTemplItemLeft" align="right" valign="top">decltype(auto) constexpr&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#acef38216a6c6da0296a5f7b5241e951b">operator[]</a> (N &amp;&amp;n)</td></tr>
    258. 

  258. <tr class="memdesc:acef38216a6c6da0296a5f7b5241e951b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Iterable.html#ga8a484304380eae38f3d9663d98860129" title="Returns the nth element of an iterable.Given an Iterable and an IntegralConstant index,...">hana::at</a></code> <br /></td></tr>
    259. 

  259. <tr class="separator:acef38216a6c6da0296a5f7b5241e951b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    260. 

  260. </table>
    261. 

  261. <h2 class="groupheader">Associated functions</h2>
    262. 

  262. <a id="ad9d8c7efa77e573eba2dfc48b3343e66"></a>
    263. 

  263. <h2 class="memtitle"><span class="permalink"><a href="#ad9d8c7efa77e573eba2dfc48b3343e66">&#9670;&nbsp;</a></span>make&lt; tuple_tag &gt;</h2>
    264. 

  264. 

  265. <div class="memitem">
    266. 

  266. <div class="memproto">
    267. 

  267. <div class="memtemplate">
    268. 

  268. template&lt;typename ... Xn&gt; </div>
    269. 

  269. <div class="memtemplate">
    270. 

  270. template&lt;&gt; </div>
    271. 

  271. <table class="mlabels">
    272. 

  272.   <tr>
    273. 

  273.   <td class="mlabels-left">
    274. 

  274.       <table class="memname">
    275. 

  275.         <tr>
    276. 

  276.           <td class="memname">constexpr auto <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a>&lt; <a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a> &gt;</td>
    277. 

  277.         </tr>
    278. 

  278.       </table>
    279. 

  279.   </td>
    280. 

  280.   <td class="mlabels-right">
    281. 

  281. <span class="mlabels"><span class="mlabel">related</span></span>  </td>
    282. 

  282.   </tr>
    283. 

  283. </table>
    284. 

  284. </div><div class="memdoc">
    285. 

  285. <b>Initial value:</b><div class="fragment"><div class="line">= [](<span class="keyword">auto</span>&amp;&amp; ...xs) {</div><div class="line">        <span class="keywordflow">return</span> <a class="code" href="structboost_1_1hana_1_1tuple.html#a8e10223983bfb3873c285be85f7ab273">tuple</a>&lt;std::decay_t&lt;decltype(xs)&gt;...&gt;{forwarded(xs)...};</div><div class="line">    }</div></div><!-- fragment -->
    286. 

  286. <p>Function object for creating a <code>tuple</code>. </p>
    287. 

  287. <p>Given zero or more objects <code>xs...</code>, <code>make&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;</code> returns a new tuple containing those objects. The elements are held by value inside the resulting tuple, and they are hence copied or moved in. This is analogous to <code>std::make_tuple</code> for creating Hana tuples.</p>
    288. 

  288. <h2>Example </h2>
    289. 

  289. <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="core_2make_8hpp.html">boost/hana/core/make.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;string&gt;</span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line">    <span class="keyword">auto</span> xs = hana::make&lt;hana::tuple_tag&gt;(1, 2, <span class="charliteral">&#39;3&#39;</span>, std::string{<span class="stringliteral">&quot;456&quot;</span>});</div><div class="line"></div><div class="line">    constexpr <span class="keyword">auto</span> ys = hana::make&lt;hana::tuple_tag&gt;(1, <span class="charliteral">&#39;2&#39;</span>, 3.456);</div><div class="line">    static_assert(ys == hana::make_tuple(1, <span class="charliteral">&#39;2&#39;</span>, 3.456), <span class="stringliteral">&quot;&quot;</span>);</div><div class="line">}</div></div><!-- fragment --> 
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  292. <a id="af3c175cfb83276339f91e867d738a2e6"></a>
    293. 

  293. <h2 class="memtitle"><span class="permalink"><a href="#af3c175cfb83276339f91e867d738a2e6">&#9670;&nbsp;</a></span>make_tuple</h2>
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  294. 

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  298. template&lt;typename ... Xn&gt; </div>
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  304.           <td class="memname">constexpr auto make_tuple = <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a>&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>&gt;</td>
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  313. 

  314. <p>Alias to <code>make&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;</code>; provided for convenience. </p>
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  319. <h2 class="memtitle"><span class="permalink"><a href="#a749b564c8f115957837761d75191beac">&#9670;&nbsp;</a></span>to_tuple</h2>
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  320. 

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  324. template&lt;typename ... Xn&gt; </div>
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  330.           <td class="memname">constexpr auto to_tuple = <a class="el" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">to</a>&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>&gt;</td>
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  340. <p>Equivalent to <code>to&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;</code>; provided for convenience. </p>
    341. 

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  345. <h2 class="memtitle"><span class="permalink"><a href="#a1997546daf58a48cc15498d338a03da3">&#9670;&nbsp;</a></span>tuple_t</h2>
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  349. <div class="memtemplate">
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  350. template&lt;typename ... Xn&gt; </div>
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  352. template&lt;typename ... T&gt; </div>
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  358.           <td class="memname">constexpr implementation_defined tuple_t {}</td>
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  367. 

  368. <p>Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1type.html" title="C++ type in value-level representation.">hana::type</a></code>s. </p>
    369. 

  369. <p>This is functionally equivalent to <code>make&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;(type_c&lt;T&gt;...)</code>, except that using <code>tuple_t</code> allows the library to perform some compile-time optimizations. Also note that the type of the objects returned by <code>tuple_t</code> and an equivalent call to <code>make&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;</code> may differ.</p>
    370. 

  370. <h2>Example </h2>
    371. 

  371. <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="core_2to_8hpp.html">boost/hana/core/to.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="type_8hpp.html">boost/hana/type.hpp</a>&gt;</span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line">    <a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line">        hana::to_tuple(hana::tuple_t&lt;<span class="keywordtype">int</span>, <span class="keywordtype">char</span>, <span class="keywordtype">void</span>, <span class="keywordtype">int</span>(<span class="keywordtype">float</span>)&gt;)</div><div class="line">            ==</div><div class="line">        hana::make_tuple(hana::type_c&lt;int&gt;, hana::type_c&lt;char&gt;, hana::type_c&lt;void&gt;, hana::type_c&lt;<span class="keywordtype">int</span>(<span class="keywordtype">float</span>)&gt;)</div><div class="line">    );</div><div class="line">}</div></div><!-- fragment --> 
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  375. <h2 class="memtitle"><span class="permalink"><a href="#a85c2f16caa2a1e12eefd1b3f69fa658e">&#9670;&nbsp;</a></span>tuple_c</h2>
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  380. template&lt;typename ... Xn&gt; </div>
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  382. template&lt;typename T , T ... v&gt; </div>
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  397. 

  398. <p>Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">hana::integral_constant</a></code>s. </p>
    399. 

  399. <p>This is functionally equivalent to <code>make&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;(integral_c&lt;T, v&gt;...)</code>, except that using <code>tuple_c</code> allows the library to perform some compile-time optimizations. Also note that the type of the objects returned by <code>tuple_c</code> and an equivalent call to <code>make&lt;<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>&gt;</code> may differ.</p>
    400. 

  400. <h2>Example </h2>
    401. 

  401. <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="core_2to_8hpp.html">boost/hana/core/to.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="front_8hpp.html">boost/hana/front.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="integral__constant_8hpp.html">boost/hana/integral_constant.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>&gt;</span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line">    <a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line">        hana::tuple_c&lt;int, 0, 1, 2&gt;</div><div class="line">            ==</div><div class="line">        hana::make_tuple(hana::int_c&lt;0&gt;, hana::int_c&lt;1&gt;, hana::int_c&lt;2&gt;)</div><div class="line">    );</div><div class="line"></div><div class="line">    <a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(<a class="code" href="group__group-Iterable.html#ga8a67ea10e8082dbe6705e573fa978444">hana::front</a>(hana::tuple_c&lt;int, 0, 1, 2&gt;) == hana::int_c&lt;0&gt;);</div><div class="line">}</div></div><!-- fragment --> 
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  403. </div>
    404. 

  404. <h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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    406. 

  406. <h2 class="memtitle"><span class="permalink"><a href="#a4e4e6193df38146b1eab93bcf963fc81">&#9670;&nbsp;</a></span>tuple() <span class="overload">[1/2]</span></h2>
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  411. template&lt;typename ... Xn&gt; </div>
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  414.           <td class="memname">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">boost::hana::tuple</a>&lt; Xn &gt;::<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> </td>
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  415.           <td>(</td>
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  416.           <td class="paramtype">Xn const &amp;...&#160;</td>
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  417.           <td class="paramname"><em>xn</em></td><td>)</td>
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  422. 

  423. <p>Initialize each element of the tuple with the corresponding element from <code>xn...</code>. Only exists when all the elements of the tuple are copy-constructible. </p>
    424. 

  424. <dl class="section note"><dt>Note</dt><dd>Unlike the corresponding constructor for <code><a class="el" href="structstd_1_1tuple.html" title="Adapter for std::tuples.">std::tuple</a></code>, this constructor is not explicit. This allows returning a tuple from a function with the brace-initialization syntax. </dd></dl>
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    429. 

  429. <h2 class="memtitle"><span class="permalink"><a href="#a9a5dd3930d94a900190de98247e0c415">&#9670;&nbsp;</a></span>tuple() <span class="overload">[2/2]</span></h2>
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  434. template&lt;typename ... Xn&gt; </div>
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  436. template&lt;typename ... Yn&gt; </div>
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  439.           <td class="memname">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">boost::hana::tuple</a>&lt; Xn &gt;::<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> </td>
    440. 

  440.           <td>(</td>
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  441.           <td class="paramtype">Yn &amp;&amp;...&#160;</td>
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  442.           <td class="paramname"><em>yn</em></td><td>)</td>
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  447. 

  448. <p>Initialize each element of the tuple by perfect-forwarding the corresponding element in <code>yn...</code>. Only exists when all the elements of the created tuple are constructible from the corresponding perfect-forwarded value. </p>
    449. 

  449. <dl class="section note"><dt>Note</dt><dd>Unlike the corresponding constructor for <code><a class="el" href="structstd_1_1tuple.html" title="Adapter for std::tuples.">std::tuple</a></code>, this constructor is not explicit. This allows returning a tuple from a function with the brace-initialization syntax. </dd></dl>
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  452. </div>
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  453. </div><!-- contents -->
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  454. </div><!-- doc-content -->
    455. 

  455. <!--
    456. 

  456. Copyright Louis Dionne 2013-2017
    457. 

  457. Distributed under the Boost Software License, Version 1.0.
    458. 

  458. (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
    459. 

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  464.   <ul>
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  465.     <li class="navelem"><b>boost</b></li><li class="navelem"><a class="el" href="namespaceboost_1_1hana.html">hana</a></li><li class="navelem"><a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a></li>
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